CN201781316U

CN201781316U - Dual power automatic switching system

Info

Publication number: CN201781316U
Application number: CN2010201776093U
Authority: CN
Inventors: 郑建平
Original assignee: HANGZHOU DOWIN TECHNOLOGY Co Ltd
Current assignee: HANGZHOU DOWIN TECHNOLOGY Co Ltd
Priority date: 2010-04-29
Filing date: 2010-04-29
Publication date: 2011-03-30
Anticipated expiration: 2020-04-29

Abstract

The utility model relates to the power supply control technique, and aims at providing a dual power automatic switching system. The system includes a load switch and an automatic switching switch used for switching a load circuit from a main power supply to a standby power supply, the automatic switching switch is connected to a programmable logic controller PLC through a signal line, and a phase failure detection module is arranged in the programmable logic controller PLC and is connected with the main power supply and the standby power supply respectively. The system integrates switch and logic control; the switching reliability is higher, and the functions are more complete; moreover, electric and mechanical dual-locking are realized, the safe and reliable switch of the power supplies can be ensured fundamentally, multiple electric quantities can be centralized and monitored conveniently, and a remote control system can be accessed according to requirements.

Description

The duplicate supply automatic switchover system

Technical field

The utility model relates to the power supply control technology, and more particularly, the utility model relates to a kind of duplicate supply automatic switchover system.

Background technology

The duplicate supply switched system that present domestic existing power supply switched system is made up of contactor or circuit breaker, there is a lot of drawbacks in this type of duplicate supply switched system, and the single situation of function.Existing duplicate supply switched system is just finished simple change action, a road other power supply of starting under the situation of one road power source trip fault or outage, and be local operation basically, there is not long-range controlled function, can not realize that four is distant.Its monitored parameter to power supply is considerably less, just judges situations such as short circuit and overload, can not the quality of power supply be quantized, and can not write down related data information accurately and reliably.Its extendable functions does not almost have, want to finish the unattended duty that adapts to transformer station or the needs of few people's post, will additionally increase many other auxiliary finishing of equipment, so just make the cost increase of whole system, globality is not strong, a series of problems such as Installation and Debugging trouble.

The utility model content

The technical problems to be solved in the utility model is, overcomes the deficiencies in the prior art, and a kind of duplicate supply automatic switchover system is provided.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

The utility model provides a kind of duplicate supply automatic switchover system, comprises on-load switch and the automatic change-over that is used for load circuit is switched to from main power source stand-by power supply; Described automatic change-over is connected to Programmable Logic Controller PLC by holding wire, the built-in open phase detection module of Programmable Logic Controller PLC, and open phase detection module connects main power source and stand-by power supply respectively.

As a kind of improvement, described Programmable Logic Controller PLC also comprises an expansion module, and described open phase detection module is connected to overvoltage and the under-voltage detection module that is built in this expansion module.

As a kind of improvement, in described expansion module, has the following at least a mode of connection: connect the analog quantity input by the multiple twin shielded type cable; If the voltage input has in voltage fluctuation or the external cabling electrical Interference is arranged, then connect a smmothing capacitor; If use the electric current input, then V+ terminal and V-terminal short circuit; If there is electrical Interference, then the shell ground of FG end is connected with the earth terminal of expansion module; The earth terminal of expansion module is connected with the earth terminal of master unit, and possesses three grades of ground connection.

Compared with prior art, the beneficial effects of the utility model are:

Duplicate supply automatic switchover system in the utility model, adopt ATS automatic change-over and intellectual monitoring unit and control technology, integrate switch and logic control, switch higher, the more perfect functions of reliability, not only realized electric and mechanical two locking, fundamentally guarantee the safe and reliable switching of power supply, can also realize the concentrated monitoring of many electric weight easily, and access to remote monitoring system as required.Possess skills advanced person, perfect performance, safe and reliable, automaticity is high, easy to operate, distinguishing feature such as the scope of application is wide, it is the new high-tech product that a new generation replaces the duplicate supply switching mode of traditional employing A.C. contactor or circuit breaker formation comprehensively, satisfy the needs of nobody value of keeping of transformer station fully, for transformer station provides safe and reliable power supply.This duplicate supply automatic switchover system is applicable to that transformer station, power plant, communications equipment room, bank, hospital, colliery, boats and ships, workflow waterline, chemical industry, metallurgy, people's air defense and military installations etc. do not allow outage or carry out unwatched important electricity consumption place.

Description of drawings

Fig. 1 is the block diagram of the utility model implementation;

Fig. 2 is the utility model expansion module mode of connection schematic diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail, but not as to qualification of the present utility model.

Described Programmable Logic Controller PLC also comprises an expansion module, and described open phase detection module is connected to overvoltage and the under-voltage detection module that is built in this expansion module.

Because be implemented in by software mode and insert open phase detection module among the Programmable Logic Controller PLC and in expansion module, to insert overvoltage and under-voltage detection module, be realization means well known to those skilled in the art, so the utility model repeats no more this.

As everyone knows, ATS is the abbreviation of English Automatic Transfer Switch (automatic change-over), along with domestic raising of switching notion for electricity consumption, obtained numerous designers' generally approval in nearly 2 years at home, gradually the power domain performance must be many effect.

ATS is with the device for switching of load circuit from an automatic changing-over of power supply to another (standby) power supply, to guarantee that important load is continuous, reliability service.It is compared with the automatic switchover that two circuit breakers of use of using always carry out main power supply, and have following characteristics: a. switch speed is fast; B. engineering cost low (ATS can replace two circuit breakers); C. chain reliable, ATS inside has reliable mechanical chain and electrical interlocks, has avoided two circuit breakers to have only the unsteadiness of electrical interlocks.D. easy to maintenance.ATS mainly is made up of two parts: Switch main body and controller, Switch main body are divided into PC level and CB level.1.PC level: integral structure (bikini).It is the special switch that duplicate supply switches, have simple in structure, volume is little, self is chain, conversion speed fast (in the 0.2S), advantage such as safe, reliable, but needs outfit short-circuit protective device.2..CB level: be equipped with the ATS of overcurrent trip, the disjunction short circuit current can be connected and be used for to its main contact.It adds mechanical chain by two circuit breakers and forms, and has short-circuit protection function; Controller is mainly used to detect monitored power supply (two-way) working condition, when monitored power supply breaks down (deviation occurring as any phase phase failure, under-voltage, decompression or frequency), controller sends action command, Switch main body then is being with load to be converted to another power supply automatically from a power supply, and its capacity of stand-by power supply generally only is the 20%-30% of power supply capacity commonly used.

The operation principle of ATS is: be the operating mechanism of main deciliter power by solenoid, drive the interlock transverse axis, make the Y type moving contact in the arc control device carry out conversion between the external power supply terminal, reach the switching effect between main power source and the stand-by power supply thus according to deciliter instruction.Every phase arc control device of ATS are relatively independent enclosed construction, and whole ATS is combined by three groups or four groups of arc control device, is applicable to the power supply-distribution system of three-phase three-wire system or three-phase four-wire system.Arc control device adopt the cordwood system type package assembly, and every phase arc control device damage the use that can change and not influence whole ATS separately, have improved the on-the-spot maintenanceability of ATS.

ATS has single conduction, and promptly main power source is connected, and stand-by power supply must disconnect, and vice versa.ATS has tangible switching and shows, except that the ATS body has the switching demonstration of main power supply, also can control the input situation that indicator light reaches the indication main power supply by auxiliary switch.In order to adapt to the needs of various different operating occasions, ATS possesses manually and automatic control mode simultaneously, and manual control mode is confined to zero load deciliter maintenance occasion generally speaking.

On-load switch in the utility model can adopt the fuse type load-break switch, but the on-load disjunction can directly be mounted on the bus, also can be installed on the fixed head.Its course of work is: during separating brake, under the effect of tripping spring, main shaft turns clockwise, and by slider-crank mechanism piston is moved up on the one hand, with gas compression; The drive system of forming by two cover quadric chains makes the main switch cutter beat earlier electric arc on the other hand.Run jointly, promote the arc extinguishing plug-in strip then arcing contact is opened, when the compressed air in the cylinder is blown out lock by spout, by main shaft and drive system, main switch cutter and arc extinguishing plug-in strip are turned clockwise simultaneously, arcing contact is closed earlier; Main shaft is rotated further, and makes main contact closed subsequently.In making process, tripping spring is energy storage simultaneously.Because on-load switch can not cut-off short circuit current, so normal and current-limiting type high-tension fuse is used in combination, utilize the current-limiting function of current limiting fuse, not only finish the task of cut-offfing circuit and can significantly alleviate caused heat of short circuit current and electrodynamic effect.

In process, must can only there be a power supply and load to connect, and when one road power failure, will realize automaticallying switch based on the twin-power switch of PLC.Because in emergency service places such as important meeting room, airport, hotels, the gross power of each power consumption equipment is bigger, must use the gen-set power supply again.

In Fig. 1, A is a main power source, and B is a stand-by power supply, is connected with open phase detection module among the PLC respectively, as PLC input detection signal.The input of at first carrying out main power source A detects, when open phase detection module detects main power source A and does not have any phase phase shortage, corresponding logic switch can be closed, make expansion module accept to detect the voltage signal that the back passes the no phase shortage of coming through the PLC elementary cell, then expansion module carries out the under-voltage detection in three-phase loop of main power source A subsequently, if this moment, main power source A was good, corresponding status indicator lamp can be bright, illustrate that main power source is in good condition this moment, main power source and load simultaneously connected.In the main power source A back (be main power source A phase shortage occurs or when under-voltage) of breaking down, this moment can starter-generator, and stand-by power supply B is started, and main power source A can automatic disconnection simultaneously.After stand-by power supply B started, the phase shortage that will carry out the three-phase loop equally detected and under-voltage detection, and testing process is with main power source A.After detecting fault-free, realize the connection of stand-by power supply B and load immediately.

In the utility model, because will be to the three-way detection of three phase mains, so select the analog-to-digital conversion specific function expansion module FX2N-4A/D (MITSUBI of Mitsubishi product) that imports with 4 analog quantitys for use.FX2N-4A/D is 12 high-precision analog amount input modules, have 4 input A/D ALT-CH alternate channels, input signal types can be voltage (10～+ 10V), electric current (20～+ 20mA) and electric current (+4～+ 20mA), each passage can be appointed as voltage input or electric current input independently.And the FX2N series Programmable logic Controller (PLC) can connect 8 FX2N-4A/D at most.

FX2N-4AD analog quantity input module is the analog quantity input module of FX2N series of PLC special use.4 input channels of this module by the input terminal conversion, can be selected voltage or electric current input state arbitrarily.Input parameter is: voltage when input, input signal be DC-10V～+ 10V, input impedance is 200k Ω, resolution is 5mV; Electric current when input, input signal be DC-20mA～+ 20mA, input impedance is 250 Ω, resolution is 20 μ A.FX2N-4AD becomes 12 binary digital quantities with the analog signal conversion that receives, and is stored in 16 bit data register with the form of complement code, and numerical value is-2048～+ 2047, and transmission rate 15ms/kbit, synthesis precision are 1% of range.The operating voltage of FX2N-4AD is DC 24V, adopts photoelectric isolation technology between analog quantity and the digital quantity, but does not isolate between each passage.It consumes the electric current of PLC master unit or active expanding element 5V power slot 30mA.It takies 8 mapping tables of elementary cell, promptly accounts for 8 I/O on the software and counts, and when calculating the I/O of PLC, these 8 points can be calculated as the input point of PLC.The FX2N-4AD inside modules has a data buffer register, and it is made up of 32 16 register, and FROM that its content can be by PLC and TO instruct and read or write.

Aspect the mode of connection of FX2N-4A/D module: the analog quantity input receives by the multiple twin shielded type cable, and cable should may produce the electric wire of electrical Interference away from power line or other, as mark among Fig. 2 1.; If voltage input has voltage fluctuation, or electrical Interference is arranged in the external cabling, can connect a smmothing capacitor (0.1～0.47 μ F, 25V), as mark among Fig. 2 2.; If use the electric current input, with V+ and V-short circuit, 3. as mark among Fig. 2; If there is too much electrical Interference, connect the shell ground end of FG and the earth terminal of FX2N-4A/D module, 4. as mark among Fig. 2; Connect the earth terminal of FX2N-4A/D module and the earth terminal of master unit, under feasible situation, use three grades of ground connection, 5. as mark among Fig. 2.

At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.

Claims

1. duplicate supply automatic switchover system, comprise on-load switch and the automatic change-over that is used for load circuit is switched to from main power source stand-by power supply, it is characterized in that, described automatic change-over is connected to Programmable Logic Controller PLC by holding wire, the built-in open phase detection module of Programmable Logic Controller PLC, open phase detection module connects main power source and stand-by power supply respectively.

2. duplicate supply automatic switchover system according to claim 1 is characterized in that, described Programmable Logic Controller PLC also comprises an expansion module, and described open phase detection module is connected to overvoltage and the under-voltage detection module that is built in this expansion module.

3. duplicate supply automatic switchover system according to claim 2 is characterized in that, has the following at least a mode of connection in described expansion module: connect the analog quantity input by the multiple twin shielded type cable; If the voltage input has in voltage fluctuation or the external cabling electrical Interference is arranged, then connect a smmothing capacitor; If use the electric current input, then V+ terminal and V-terminal short circuit; If there is electrical Interference, then the shell ground of FG end is connected with the earth terminal of expansion module; The earth terminal of expansion module is connected with the earth terminal of master unit, and possesses three grades of ground connection.